The supreme triumph of reason is to cast doubt upon its own validity.

Your neighbor's vision is as true for him as your own vision is true for you.

Cure yourself of the affliction of caring how you appear to others. Concern yourself only with how you appear before God, concern yourself only with the idea that God may have of you.

Science is the most intimate school of resignation and humility, for it teaches us to bow before the seemingly most insignificant of facts.

Was man made for science, or was science made for man?

There is no true love save in suffering, and in this world we have to choose either love, which is suffering, or happiness. Man is the more man - that is, the more divine - the greater his capacity for suffering, or rather, for anguish.

A man does not die of love or his liver or even of old age; he dies of being a man.